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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3/I
- Part No.:
- SMB8J20CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
SMB8J20CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J20CAHM3/I datasheet, SMB8J20CAHM3/I pinout, SMB8J20CAHM3/I application, or SMB8J20CAHM3/I equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 rating, and thermal resistance (RθJA = 72 °C/W) for surface-mount reliability in harsh environments.
Technical Context
This TVS diode operates as a voltage-clamping protector using an avalanche junction to shunt transient energy away from sensitive downstream circuitry. Its bidirectional architecture enables symmetrical clamping for AC-coupled or floating signal lines, with low incremental surge resistance ensuring minimal voltage overshoot during fast transients (e.g., ISO 7637-2 pulse 1/2a/5a).
Designed for automotive-grade robustness, SMB8J20CAHM3/I meets AEC-Q101 stress tests including temperature cycling, HTRB, and ESD (HBM ≥ 8 kV). The glass-passivated chip junction and matte tin-plated leads support solderability per J-STD-002 and whisker resistance per JESD 201 Class 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working range for protected line |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots |
| VC @ IPPM | 32.4 V at 24.7 A - clamped voltage under 10/1000 µs surge; limits stress on downstream ICs like CAN transceivers or ADC inputs |
| PPPM | 800 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 72 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design margin |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-terminal configuration with cathode band omitted per bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally above ±VBR - no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Plastic molded case transfers heat to PCB copper pads; requires minimum 5.0 mm × 5.0 mm pad area per terminal per datasheet fig. 2 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment - supports PPAP documentation |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and JEDEC JS709E; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no floor life limitation or baking requirement prior to assembly |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage exposure during surge events - critical for protecting 3.3 V or 5 V logic interfaces downstream |
Applications
| Automotive Sensor Protection | Industrial Fieldbus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role: Bidirectional clamping TVS placed directly at connector entry point to absorb >800 W surges before reaching transceiver ICs. Use Value: Enables compliance with ISO 16750-2 (load dump up to 120 V) and ISO 7637-2 (pulse 5a) without derating or external series impedance. | Use Scenario: Shielding RS-485/RS-422 transceivers in PLC I/O modules from lightning-induced surges on long cable runs in factory automation. IC Role / Device Role: Primary surge suppression device on differential data lines, mounted adjacent to connector with symmetric trace routing. Use Value: Maintains signal integrity by limiting clamped voltage to ≤32.4 V while surviving repeated 4 kV (IEC 61000-4-5) surges without degradation. |
| Consumer Power Adapter Input | Medical Diagnostic Equipment Port |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and controller ICs against line surges (e.g., EN 61000-4-5) in wall-wart designs. IC Role / Device Role: Secondary-level TVS after MOV, providing precise clamping and fast response where MOVs exhibit latency and wear-out. Use Value: Extends system lifetime by reducing stress on bridge rectifiers and PWM controllers during repetitive 1 kV/2 kV surges. | Use Scenario: Protecting USB, UART, or analog front-end ports on portable ultrasound or patient monitoring devices from ESD and EFT events. IC Role / Device Role: Board-level ESD suppressor on exposed connectors, rated for ±8 kV contact discharge (IEC 61000-4-2) and 40 A surge (IEC 61000-4-4). Use Value: Meets IEC 60601-1-2 4th edition immunity requirements without adding bulk capacitance that would distort diagnostic signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHE3/I | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification; acceptable for commercial/industrial use but not automotive Tier 1 supply chains requiring HM3 | Select SMB8J20CAHE3/I only if halogen-free material is not mandated by end-customer specification |
| SMAJ20CAHM3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC ratings | Reduced surge handling; suitable for lower-energy threats (e.g., IEC 61000-4-2 ESD only) but not full IEC 61000-4-5 Level 4 | Choose SMAJ20CAHM3 only when board space is constrained and surge threat level is limited to <400 W |
Compared with SMB8J20CAHE3/I and SMAJ20CAHM3, SMB8J20CAHM3/I uniquely combines 800 W surge capacity, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for high-reliability automotive powertrain and chassis systems requiring full environmental compliance.
Availability
SMB8J20CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial fieldbus protection, and medical diagnostic port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMB8J20CAHM3/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.
The SMB8JxxCA family targets high-power transient suppression in space-constrained, high-reliability applications - engineered specifically for AEC-Q101 compliance and robust surge immunity in automotive and industrial environments.
FAQ
What does the 'HM3' suffix indicate in SMB8J20CAHM3/I?
The 'HM3' suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also signifies qualification to AEC-Q101 for automotive use. SMB8J20CAHM3/I is fully compliant with JEDEC JS709E and EU Directive 2011/65/EU, distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants.
Is SMB8J20CAHM3/I unidirectional or bidirectional?
SMB8J20CAHM3/I is a bidirectional TVS diode, confirmed by its 'CA' designation (C = bidirectional, A = standard tolerance) and absence of cathode band marking. Its symmetrical VBR min/max (22.2 V / 24.5 V) applies equally in both directions, enabling protection of AC-coupled or floating lines without polarity concerns during PCB layout.
What is the maximum clamping voltage of SMB8J20CAHM3/I and under what test condition?
The maximum clamping voltage of SMB8J20CAHM3/I is 32.4 V, measured at a peak pulse current (IPPM) of 24.7 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does SMB8J20CAHM3/I require special PCB layout considerations?
Yes - SMB8J20CAHM3/I requires minimum 5.0 mm × 5.0 mm copper pad area per terminal (per datasheet fig. 2) to achieve rated 800 W PPPM and thermal resistance of 72 °C/W. Short, direct traces to ground/power planes and avoidance of vias in the current path are essential to preserve low-inductance clamping performance during fast transients.
How does SMB8J20CAHM3/I differ from SMB10J20A in surge capability?
SMB8J20CAHM3/I is bidirectional with 800 W PPPM and 24.7 A IPPM, whereas SMB10J20A is unidirectional with 1000 W PPPM and 30.9 A IPPM. The '8' prefix indicates 800 W rating; '10' indicates 1000 W. Both share identical VWM (20 V) and VC (32.4 V), but SMB10J20A cannot protect AC signals due to unidirectional polarity - SMB8J20CAHM3/I is required for balanced line protection.
SMB8J20CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 24.7A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J20CAHM3/I FAQ
1.How can I place an order for SMB8J20CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMB8J20CAHM3/I reliable?
The price and inventory of SMB8J20CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3/I?
SMB8J20CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMB8J20CAHM3/I?
For technical support, including SMB8J20CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3/I requirements.
6.How does Aetrix verify that SMB8J20CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMB8J20CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3/I?
All SMB8J20CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMB8J20CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3/I Tags
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